Changed  HashTable::EnsureCapacity to gurantee at least 50% of the entries are free (up from 25%). This reduces the mount of probing in large hash tables.
Changed  HashTable::EnsureCapacity to gurantee at least 50% of the entries are free (up from 25%).
This reduces the mount of probing in large hash tables.

Review URL: http://codereview.chromium.org/150017

git-svn-id: b158db1e4b4ab85d4c9e510fdef4b1e8c614b15b@2286 ce2b1a6d-e550-0410-aec6-3dcde31c8c00

UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh,UniversalFuture/moosh